/*
#include<stdio.h>
int ave(int a,int b)
{
int c;
c=(a+b)/2;
return c;

}
main()
{
	int x,y,z;
	printf("please input x,y:\n");
	scanf("%d,%d",&x,&y);
	z=ave(x,y);
	printf("%d",z);
}
*/
 